<?php echo apply_filters(‘the_content’, $string_containing_url); ?>
It’s actually quite simple. To display a link to the parent page:
<?php wp_list_pages('title_li=&include='.$post->post_parent) ?>
Unfortunately, this will always display an html list item (li) which is likely not what you want. Thus it gets a little nastier, using php search and replace.
<?php if(get_the_title($post->post_parent) != the_title(' ' , ' ',false)) {
$parent = wp_list_pages('echo=0&title_li=&include='.$post->post_parent);
$parent = str_replace('<li class="page_item current_page_parent">', '', $parent);
$parent = str_replace('</li>', '', $parent);
echo "« back to $parent";
} ?>